Which of the following is not tetrahedral in shape?
(i) NH4+
(ii) SiCl4
(iii) SF4
(iv) SO42-
NCERT Class XII
Chemistry - Exemplar Problems
Chapter 7. The p-block elements
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SF4 is not tetrahedral in shape. It is octahedral but due to the presence of 2 lone pair, it became square planer.
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Answer: (iii). SF4 is not tetrahedral in shape.
Explanation:
(i). NH4+ is tetrahedral in shape. The geometry of NH4+ is less distorted due to less between the bond pairs.
(ii). SiCl4 is tetrahedral in shape and thus it is trigonol planar. There are 4 bond pairs and no lone pairs.
(III). SF4 is trigonal bipyramid. The sulphur is in centre with two fluoride at the four corners with slightly distorted with each other.
(Iv). SO42- is tetrahedral in shape according to the VSEPR theory.
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